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Picture of the Day

VLBA Distance Measurement Is Key To Producing First "Complete Description" Of A Black Hole

Using several telescopes, both ground-based and in orbit, scientists were able to unravel longstanding mysteries about the object called Cygnus X-1, a famous binary-star system discovered to be strongly emitting X-rays nearly a half-century ago. The system consists of a black hole and a companion star from which the black hole is drawing material. This image is an artist's conception of Cygnus X-1: Black hole draws material from companion star (right) into hot, swirling disk.
Image credit: Chandra X-Ray Observatory, NASA